[linux-lvm] Very slow i/o after snapshotting
mcsontos at redhat.com
Tue Jul 9 12:19:16 UTC 2013
On 07/09/2013 01:51 PM, Micky wrote:
>> Is this supposed to be a bug report ?
> Sorry for bashing the info. I was just answering the questions. LOL!
>> So far I've no idea about disks/tables in use, system/kernel in use, lvm
>> version in use....
> RHEL 6.4 kernel-2.6.32-358.el6 (also tested with self compiled 3.8)
> Disk on external mega raid controller with ext4
How does it perform without snapshot? I have seen a sluggish RAID array
when run out of battery.
Is there a reason to use that big chunks?
If the origin is seeing a lot of small dispersed writes using big chunk
may multiply it manyfold (actually worst case 128-times: every 4k write
generating 512k read from origin and then written to snapshot.)
> Running Xen hypervisor but tested without it as well
> linux-lvm mailing list
> linux-lvm at redhat.com
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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